4000% is the change from 8 to 328
Calculation steps:
[( 328 - 8 ) ÷ 8] x 100 = 4000%
Formula
Percentage change = [(328 - 8) / 8] x 100
Subtract the new number by the original number
328 - 8 = 320
320 ÷ 8 = 40
40 x 100 = 4000%
Example